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d in (-oo:+oo)
4-(2*d) = 22 // - 22
4-(2*d)-22 = 0
4-2*d-22 = 0
-2*d-18 = 0 // + 18
-2*d = 18 // : -2
d = 18/(-2)
d = -9
d = -9
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